Similarities and differences between powder coating and paint coating

• Previous
• Next

Powder coating and paint coating are two common metal surface treatment processes, both of which can improve the aesthetics and durability of metals, but also have some differences.

Powder coating is done by spraying powder-like paint onto the surface of the workpiece with an electrostatic spraying machine. Under the action of electrostatic force, the powder will be evenly adsorbed on the surface of the workpiece, forming a powder-like coating. Then the powder coating is baked at high temperature to make the powder coating level and cured into a final coating with different effects.

Spray coating is a solvent or water-based liquid coating sprayed onto the surface of the workpiece with a spray gun and dried in the air or baked through low temperature to form a thin film-like coating.

In comparison, powder coating has the following advantages.

1, Environmentally friendly: 

Powder coatings contain no organic solvents and no volatile organic compounds (VOCs), so they have little impact on the environment and human health.

2, Durable: 

powder coating has strong acid resistance, alkali resistance, impact resistance, abrasion resistance and weather resistance, and can withstand strong ultraviolet light and acid rain and other natural environmental erosion for a long time without fading, blistering, cracking and other phenomena.

3, Economy: 

The utilization rate of powder coating is high, over 95%, while the utilization rate of spray paint is only 30%-40%, thus saving material cost. At the same time, as no sanding, scraping putty and other pre-treatment steps, also save labor and time costs.

4, Aesthetics: 

Powder Lotus can form various colors and glossy effects, and the surface is smooth and even without hanging phenomenon.

From the four aspects of environmental protection, durability, economy and aesthetics, powder lotus is better than spray paint. Of course, not all metals are suitable for the use of powder combing process. For example, some cannot withstand high temperature (above 200℃)

Powder coating is an environmentally friendly coating

Powder coating is a solvent-free 100% solid powder coating, its dispersion medium is air, not solvent and water. 

Therefore, it does not produce pollutants such as volatile organic compounds (VOCs) during production, transportation, storage and use, nor does it pose a risk of fire and explosion. 

In contrast, spray paint coatings contain a large number of organic solvents, which not only cause pollution to the environment, but also harmful to human health.

In addition, the powder lotus also has the characteristics of recyclability. In the process of lotus spraying, the excess powder not adsorbed on the surface of the workpiece can be collected through the recycling device, and after screening, mixing and reuse. 

This saves material cost and reduces the waste disposal problem. Lotus can not be recycled, and will produce a lot of waste gas and waste water in the spraying process.

Conclusion

To sum up, powder coating has obvious environmental advantages and meets the world's requirements for low carbon development and green transformation.